Joining Dissimilar Metal Pipes - Out of New Well and Expansion Tank

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Chuck B

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Have just had a new well drilled and a line run into my small northern Michigan cottage. As the line enters the cabin, it branches off to a stainless steel expansion tank and then to a water shutoff and spigot. The piping where the spigot is connected is galvanized, and the spigot seems to be brass.
I want to remove the spigot (there is a shut off further up the line after the expansion tank) and begin to attach 3/4" copper which will then go to a sediment filter, water softener, and water heater.
Am I guessing correctly: The galvanized pipe has to be connected to a brass nipple somehow (not directly to copper ever), then you attach the copper to that? Teflon tape ok? This must be like a water heater connection right? Except that a union is used there (dielectric union) so the heater can be replaced again? Would I use that (dielectric union) in my application, remembering that there is a plastic sleeve in those unions - improvement over simple brass?

Thanks. Chuck
 

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Yes, you are correct on everything, if I am understanding you correctly. There is also, a rubber gasket in the union in addition, to the plastic.
 

Cacher_Chick

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I would go with a brass nipple before I would the dielectric union with the plastic insert.

You can screw a brass nipple into a galvanized coupling on one side and a copper x female adapter on the other.
 

Chuck B

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and would I use teflon tape where the brass nipple screws into the galvanized fitting, and then again where the copper meets the other end...or is pipe dope preferable? thanks!
 

Gary Swart

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The pipe dope vs Teflon tape vs both is on going. So pick one or the other or both and you'll almost always be right!
 
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